@article{DAN_1968_179_1_a2,
     author = {Yu. V. Komlenko and E. L. Tonkov},
     title = {A periodic boundary value problem for an ordinary second order differential equation},
     journal = {Doklady Akademii Nauk},
     pages = {17--19},
     publisher = {mathdoc},
     volume = {179},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_1_a2/}
}